Offhand I don't recall (Jeff could measure them for you). However, there's one thing to know: there are no rules governing sidewalk width. They can vary from 3 feet to 30 feet, and in the same town, no less. It's all down to what the designer felt like accomplishing at the time any particular region is constructed. Take a tape measure the next time you wander through a town, and see if you can find any two lengths of sidewalk that are the same width... When I'm modeling, I just eyeball it!
Jeff and David, Thanks! I was just curious. Each city sidewalks are different, and some even different within the same city. Eventually my sidewalks will be whatever fits the layout scene. John